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CN-122025908-A - Energy storage system

CN122025908ACN 122025908 ACN122025908 ACN 122025908ACN-122025908-A

Abstract

An energy storage system includes a battery, an energy storage inverter, and a thermal management system, wherein the thermal management system includes a first heat exchange flow path including a first pump and a first heat exchanger for exchanging heat with the battery and configured to form a first heat exchange circuit when the first pump is on, a second heat exchange flow path including a second pump and a second heat exchanger for exchanging heat with the energy storage inverter and configured to form a second heat exchange circuit when the second pump is on, and a flow path switching mechanism through which the first heat exchange flow path and the second heat exchange flow path are in operable communication, wherein an operation mode switch of the thermal management system is achieved by an on-off operation of the first pump and the second pump and a switching operation of the flow path switching mechanism such that in a first operation mode the first heat exchange circuit and the second heat exchange circuit operate independently, or in a second operation mode a heat exchange combination circuit including at least a portion of the flow paths of the first heat exchange circuit and the second heat exchange flow path is formed.

Inventors

  • HUANG YANCONG
  • XING YANQING
  • LI HUAJIE

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (17)

  1. 1. An energy storage system comprising a battery (10), an energy storage converter (20) and a thermal management system (30), wherein the thermal management system (30) comprises: A first heat exchange flow path (31) including a first pump (311) and a first heat exchanger (312) for heat exchange with the battery (10), and configured to form a first heat exchange circuit when the first pump (311) is turned on; a second heat exchange flow path (32) including a second pump (321) and a second heat exchanger (322) for exchanging heat with the energy storage converter (20), and configured to form a second heat exchange circuit when the second pump (321) is turned on, and A flow path switching mechanism (34), the first heat exchange flow path (31) and the second heat exchange flow path (32) being in operable communication by the flow path switching mechanism (34); Wherein the operation mode switching of the thermal management system (30) is achieved by an opening and closing operation of the first pump (311) and the second pump (321) and a switching operation of the flow path switching mechanism (34), such that in a first operation mode of the thermal management system (30), the first heat exchange circuit and the second heat exchange circuit are operated independently, or in a second operation mode of the thermal management system (30) a heat exchange combined circuit is formed, the heat exchange combined circuit comprising at least part of the flow paths of the first heat exchange circuit and the second heat exchange flow path (32).
  2. 2. The energy storage system according to claim 1, wherein the flow path switching mechanism (34) includes: At least two communication flow paths (33), both ends of each communication flow path (33) being respectively communicated with the first heat exchange flow path (31) and the second heat exchange flow path (32), and A control valve (341) provided in at least one of the at least two communication channels (33) and configured to switch on/off of a communication channel (33) in which the control valve (341) is provided in the at least two communication channels (33); Wherein in a first operation mode of the thermal management system (30), the first pump (311) and the second pump (321) are both opened, the control valve (341) is switched to an off state so as to form the first heat exchange loop and the second heat exchange loop which independently operate, or in a second operation mode of the thermal management system (30), the first pump (311) is opened, the second pump (321) is closed, and the control valve (341) is switched to an on state so as to form a heat exchange combined loop driven by the second pump (321) in the second operation mode of the thermal management system (30).
  3. 3. Energy storage system according to claim 2, wherein the at least two communication flow paths (33) comprise: A first communication passage (331) having one end communicating with a first position (p 1) of the first heat exchange passage (31) and the other end communicating with a second position (p 2) of the second heat exchange passage (32), and A second communication flow path (332) having one end communicating with a third position (p 3) of the first heat exchange flow path (31) and the other end communicating with a fourth position (p 4) of the second heat exchange flow path (32); Wherein the second heat exchange flow path (32) comprises a first part heat exchange flow path (323) and a second part heat exchange flow path (324), one end of the first part heat exchange flow path (323) is communicated with one end of the second part heat exchange flow path (324) at the second position (p 2), the other end of the first part heat exchange flow path (323) is communicated with the other end of the second part heat exchange flow path (324) at the fourth position (p 4), the second pump (321) is positioned in the first part heat exchange flow path (323), and the heat exchange combination loop comprises the first heat exchange flow path (31) and the second part heat exchange flow path (324).
  4. 4. A storage system according to claim 3, wherein the second heat exchanger (322) is located within the second partial heat exchange flow path (324).
  5. 5. The energy storage system of claim 3 or 4, wherein the second heat exchange flow path (32) further comprises: a natural cooling heat exchanger (325) is located within the second partial heat exchange flow path (324).
  6. 6. The energy storage system of claim 5, wherein the natural cooling heat exchanger (325) comprises a microchannel heat exchanger (3251).
  7. 7. The energy storage system of any of claims 3-6, wherein the second location (p 2) is located on an outlet side of the second pump (321) and the fourth location (p 4) is located on an inlet side of the second pump (321), the second heat exchange flow path (32) further comprising: a one-way valve (326) located within the first portion heat exchange flow path (323) and between the outlet of the second pump (321) and the second location (p 2); wherein the one-way valve (326) is configured to conduct in one direction from the second pump (321) to the second position (p 2).
  8. 8. The energy storage system of any of claims 3-6, wherein the thermal management system (30) further comprises: a compression refrigeration cycle (36) including an evaporator (364); Wherein a part of the first heat exchange flow path (31) passes through the evaporator (364) and exchanges heat with the compression refrigeration cycle (36) through the evaporator (364).
  9. 9. The energy storage system of claim 8, wherein a portion of the first heat exchange flow path (31) through the evaporator (364) is located between the first location (p 1) and the third location (p 3).
  10. 10. The energy storage system according to any one of claims 3-9, wherein the first position (p 1) is located at an outlet side of the first pump (311), the third position (p 3) is located at an inlet side of the first pump (311), and the control valve (341) is provided at the first position (p 1) and configured to control on-off and flow of the first communication flow path (331).
  11. 11. The energy storage system of claim 10, wherein the thermal management system (30) further comprises: an expansion tank (333) provided in the second communication flow path (332), in a position adjacent to the third position (p 3) in the first heat exchange flow path (31), or in a position adjacent to the fourth position (p 4) in the second heat exchange flow path (32).
  12. 12. The energy storage system of any of claims 1-11, wherein the thermal management system (30) further comprises a processor (35), the processor (35) configured to: Switching the thermal management system (30) to a first mode of operation of the thermal management system (30) in response to the ambient temperature being greater than or equal to a first ambient temperature threshold, and Responsive to the ambient temperature being less than or equal to a second ambient temperature threshold, causing the thermal management system (30) to switch to a second mode of operation of the thermal management system (30); wherein the first ambient temperature threshold is greater than the second ambient temperature threshold.
  13. 13. The energy storage system of claim 12, wherein the thermal management system (30) further comprises: A compression refrigeration cycle (36) including an evaporator (364) and a compressor (361), wherein a part of the first heat exchange flow path (31) passes through the evaporator (364) and exchanges heat with the compression refrigeration cycle (36) through the evaporator (364); Wherein the processor (35) is configured to: operating the compressor (361) at a first operating frequency in a first operating mode of the thermal management system (30), and -In a second operating mode of the thermal management system (30), switching off the compressor (361) or operating at a second operating frequency; Wherein the second operating frequency is less than the first operating frequency.
  14. 14. The energy storage system according to claim 12 or 13, wherein the flow path switching mechanism (34) comprises at least two communication flow paths (33), both ends of each communication flow path (33) are respectively communicated with the first heat exchange flow path (31) and the second heat exchange flow path (32), the thermal management system (30) further comprises a heating mechanism (37), the heating mechanism (37) is arranged at least one of the at least two communication flow paths (33) and is configured to heat the heat exchange medium flowing through the communication flow path (33) where the heating mechanism (37) is located when the heating function is started; Wherein the processor (35) is configured to: In a first operating mode of the thermal management system (30), switching off the heating function of the heating means (37), and In a second mode of operation of the thermal management system (30), the heating mechanism (37) is caused to switch on or off a heating function.
  15. 15. The energy storage system of claim 14, wherein the at least two communication flow paths (33) include: A first communication passage (331) having one end communicating with a first position (p 1) of the first heat exchange passage (31) and the other end communicating with a second position (p 2) of the second heat exchange passage (32), and A second communication flow path (332) having one end communicating with a third position (p 3) of the first heat exchange flow path (31) and the other end communicating with a fourth position (p 4) of the second heat exchange flow path (32); Wherein the heating mechanism (37) is provided in the first communication flow path (331) or the second communication flow path (332), and is configured to heat a heat exchange medium flowing through the first communication flow path (331) or the second communication flow path (332) in which the heating mechanism (37) is located when a heating function is turned on.
  16. 16. Energy storage system according to claim 14 or 15, wherein the heating mechanism (37) comprises: A heater (371) configured to turn on or off a heating function according to an instruction of the processor (35).
  17. 17. The energy storage system of claim 16, wherein the heating mechanism (37) further comprises: a flow control valve (372) connected in parallel with the heater (371); Wherein the flow control valve (372) is configured to control a flow of heat exchange medium through the flow control valve (372) in accordance with instructions of the processor (35).

Description

Energy storage system Technical Field The invention relates to the technical field of energy storage, in particular to an energy storage system. Background With the increasing increase of environmental pollution, the new energy industry is receiving more and more attention. In the new energy industry, battery technology is an important factor in its development. The rechargeable battery can activate the active substance to continue to use in a charging mode after discharging, and has wide application prospect in the field of large-scale energy storage. Disclosure of Invention In one aspect of the present disclosure, there is provided an energy storage system comprising a battery, an energy storage converter, and a thermal management system, wherein the thermal management system comprises: a first heat exchange flow path including a first pump and a first heat exchanger for heat exchange with the battery, and configured to form a first heat exchange circuit when the first pump is turned on; A second heat exchange flow path including a second pump and a second heat exchanger for heat exchange with the energy storage converter and configured to form a second heat exchange circuit when the second pump is turned on, and A flow path switching mechanism through which the first heat exchange flow path and the second heat exchange flow path are in operable communication; The working mode of the thermal management system is switched by the opening and closing operation of the first pump and the second pump and the switching operation of the flow path switching mechanism, so that the first heat exchange loop and the second heat exchange loop independently operate in a first working mode of the thermal management system or a heat exchange combined loop is formed in a second working mode of the thermal management system, and the heat exchange combined loop comprises at least part of flow paths of the first heat exchange loop and the second heat exchange flow path. In this embodiment, the first heat exchanger in the first heat exchange flow path and the second heat exchanger in the second heat exchange flow path can exchange heat with the battery and the energy storage converter respectively, the first heat exchange flow path and the second heat exchange flow path are in operable communication through the flow path switching mechanism, and according to a control instruction sent by the processor to the first pump in the first heat exchange flow path, the second pump in the second heat exchange flow path and the flow path switching mechanism, the first heat exchange flow path and the second heat exchange flow path can respectively form a heat exchange loop to operate independently, so that the heat exchange loops can be respectively configured and controlled according to the heat management requirements of the battery and the energy storage converter, the more flexible heat management requirements can be met, and at least part of flow paths of the first heat exchange flow path and the second heat exchange flow path can also form a heat exchange combined loop to meet the heat management requirements of the battery and the energy storage converter. In some embodiments, the flow path switching mechanism includes: At least two communication flow paths, two ends of each communication flow path being respectively communicated with the first heat exchange flow path and the second heat exchange flow path, and A control valve provided in at least one of the at least two communication channels, configured to switch on/off of a communication channel in which the control valve is provided among the at least two communication channels; The control valve is switched to an off state so as to form the first heat exchange loop and the second heat exchange loop which independently operate in a first working mode of the thermal management system, or is switched to an on state so as to form a heat exchange combined loop driven by the second pump in a second working mode of the thermal management system. In this embodiment, a communication flow path is provided, two ends of which are connected to the first heat exchange flow path and the second heat exchange flow path, and the first heat exchange flow path and the second heat exchange flow path can be conveniently connected to form a loop through the communication flow path by controlling the on-off of the control valve, and the communication flow path can be disconnected to realize mutually independent operation. The first working mode and the second working mode of the heat management system can be effectively realized by matching with the on-off control of the first pump and the second pump, and a heat exchange combined loop driven by the second pump is formed in the second working mode, so that the independence of the heat management capability respectively realized by the first heat exchange flow path and the second heat exchange flow path is prevented from being influenced by the fact t